#include <iostream>
#include <sys/types.h>
#include <sys/socket.h>
#include <cstdlib>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <pthread.h>
using namespace std;

#include "Terminal.hpp"

void Usage(std::string proc)
{
    cout << "\n\nUsage:" << proc << " server serverport\n" << endl;
}

struct ThreadData
{
    struct sockaddr_in server;
    int sockfd;
};


void* recv_message(void* args)
{
    OpenTerminal();
    ThreadData* td = static_cast<ThreadData*>(args);
    char buffer[1024];
    while(true)
    {
        struct sockaddr_in temp;
        socklen_t len = sizeof(temp);
        ssize_t s = recvfrom(td->sockfd, buffer, 1023, 0, (struct sockaddr*)&temp, &len);
        if(s > 0)
        {
            buffer[s] = 0;
            cerr << buffer << endl;
        }
    }
    return nullptr;
}
void* send_message(void* args)
{
    ThreadData* td = static_cast<ThreadData*>(args);
    string message;
    while(true)
    {
        cout << "Please Enter@ " ;
        getline(cin, message);

        //cout << message << endl;
        //1.数据 2.给谁发
        sendto(td->sockfd, message.c_str(), message.size(), 0, (struct sockaddr*)&(td->server), (socklen_t)sizeof(td->server));
    
    }
    return nullptr;
}




//./udpclient serverip serverport
int main(int argc, char* argv[])
{
    if(argc != 3)
    {
        Usage(argv[0]);
        exit(0);
    }
    std::string serverip = argv[1];
    uint16_t serverport = std::stoi(argv[2]);

    struct ThreadData td;
    bzero(&td.server, sizeof(td.server));
    td.server.sin_family = AF_INET;
    td.server.sin_port = htons(serverport);
    td.server.sin_addr.s_addr = inet_addr(serverip.c_str());

    td.sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if(td.sockfd < 0)
    {
        cout << "socker error" << endl;
        return 1;
    }

    pthread_t recvr, sender;
    pthread_create(&recvr, nullptr, recv_message, &td);
    pthread_create(&sender, nullptr, send_message, &td);



    //client要bind,只不过不需要用户显示的bind,一般有OS自由随机选择
    //一个端口号只能被一个进程bind,对于server是如此，对于client，也是如此！
    //其实client的port是多少，其实不重要，只要能保证主机上的唯一性就可以！
    //系统什么时候给我bind呢？首次发送数据的时候。

    pthread_join(recvr, nullptr);
    pthread_join(sender, nullptr);



    close(td.sockfd);

    return 0;
}